Answer to Question 1
ANS: B
Protein C has a 6-hour half-life, and so it rapidly decreases when warfarin therapy is begun, along with factor VII (both are vitamin Kdependent proteins). Full anticoagulation with warfarin is not obtained until factors X and prothrombin are decreased to less than 50, requANS: B
Protein C has a 6-hour half-life, and so it rapidly decreases when warfarin therapy is begun, along with factor VII (both are vitamin Kdependent proteins). Full anticoagulation with warfarin is not obtained until factors X and prothrombin are decreased to less than 50, requiring 4 to 7 days based on their half-lives. Because protein C is important in controlling clot formation, its decrease actually puts the patient in a prethrombotic state until full anticoagulation is obtained.
iring 4 to 7 days based on their half-lives. Because protein C is important in controlling clot formation, its decrease actually puts the patient in a prethrombotic state until full anticoagulation is obtained.
Answer to Question 2
ANS: D
The clinical laboratory scientist must immediately call the healthcare provider because this is a critical INR result and he or she must be able to intervene with appropriate patient care. The call must be documented according to the protocol established by clinical scientists in the laboratory. This is essential to prevent a bad outcome for the patient.
Open, or compound The fracture projects through the skin and there is a possibility of infection or
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